固体充填采煤大断面收作眼围岩变形特征及其控制技术

Deformation characteristics and control technology of surrounding rock of large-section finishing cut in solid backfill mining

针对唐口煤矿9301充填工作面收作眼撤架通道大、支护难度高等难题,采用理论分析、数值模拟和工业试验相结合的方法,研究了固体充填采煤大断面收作眼围岩变形特征及控制技术。在掌握固体充填收作眼围岩结构特征的基础上,利用FLAC3D数值模拟软件对收作眼的围岩变形破坏规律进行了模拟分析,得出在不同的充实率、采高以及撤架数条件下收作眼围岩的变形特征及围岩应力分布规律,并提出了固体充填大断面收作眼的围岩控制技术,同时将该技术在唐口煤矿9301充填面进行了工业性试验。试验结果表明,在整个撤架过程中收作眼的顶板下沉增量仅为60mm,收作眼围岩变形得到了有效控制。

To solve support dismantling problem of Tangkou Mine caused by big cross-section finishing cut and to control strata movement in backfilling mining face, this paper adopted the theoretical analysis, numerical simulation and industrial test method to study the characteristics of surrounding rock deformation and control technology of finishing cut. FLAC3D numerical simulation software was used to analyze the deformation laws of surrounding rock at finishing cut based on the understanding of surrounding rock structure characteristics of finishing cut of solid backfilling work face, the deformation and stress distribution characteristics of surrounding rock with different compression ratios, mining heights and the numbers of support were obtained. The corresponding surrounding rock control technology was tested to 9301 backfilling work face of Tangkou Mine. The test result showed that the sinking of roof at finishing cut increased 60 mm during the support dismantling, the surrounding rock deforma- tion had been effectively controlled.